l...@airstreamcomm.net:
> So here's the problem: 
> 
>   An unusual server rejects mail on the basis that the domain portion
>   of the FROM address in the header does not match the IP address of
>   the server.
> 
> So I need to compose a message like this:
> 
>   From: anything@<let postfix choose>
>   To: ...
>   Subject: ...
> 
> and I need postfix to replace the <let postfix choose> with whatever
> my external IP address is at the moment.
> 
> Can postfix handle this?

Yes. But, are you sure the problem is the mail header and not the
MAIL FROM command?

        Wietse

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